<?php

class JSSDK {
    public $appId;
    public $appSecret;
    public function __construct($appId,$appSecret) {
        $this->appId = $appId;
        $this->appSecret = $appSecret;
    }

    public function getSignPackage() {
        $jsapiTicket = $this->getJsApiTicket();
        // 注意 URL 一定要动态获取，不能 hardcode.
        $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
        $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

        $timestamp = time();
        $nonceStr = $this->createNonceStr();

        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

        $signature = sha1($string);

        $signPackage = array(
            "appId" => $this->appId,
            "nonceStr" => $nonceStr,
            "timestamp" => $timestamp,
            "url" => $url,
            "signature" => $signature,
            "rawString" => $string
        );
        return $signPackage;
    }

    private function createNonceStr($length = 16) {
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    private function getJsApiTicket() {
        // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
//        $data = json_decode(file_get_contents("jsapi_ticket.json"));
//        if ($data->expire_time < time()) {
        $accessToken = $this->getAccessToken();
        // 如果是企业号用以下 URL 获取 ticket
        // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
        $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
        $res = json_decode($this->httpGet($url));
        $ticket = $res->ticket;
//            if ($ticket) {
//                $data->expire_time = time() + 7000;
//                $data->jsapi_ticket = $ticket;
//                $fp = fopen("jsapi_ticket.json", "w");
//                fwrite($fp, json_encode($data));
//                fclose($fp);
//            }
//        } else {
//            $ticket = $data->jsapi_ticket;
//        }

        return $ticket;
    }

    private function getAccessToken() {
        // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
//        $data = json_decode(file_get_contents("access_token.json"));
//        $data->expire_time = 0;
//        $data->access_token = '';
//        if ($data->expire_time < time()) {
        // 如果是企业号用以下URL获取access_token
        // $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
        $res = json_decode($this->httpGet($url));
        $access_token = $res->access_token;
//            if ($access_token) {
//                $data->expire_time = time() + 7000;
//                $data->access_token = $access_token;
//                $fp = fopen("access_token.json", "w");
//                fwrite($fp, json_encode($data));
//                fclose($fp);
//            }
//        } else {
//            $access_token = $data->access_token;
//        }
        return $access_token;
    }

    private function httpGet($url) {
//        $curl = curl_init();
//        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
//        curl_setopt($curl, CURLOPT_TIMEOUT, 500);
//        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
//        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
//        curl_setopt($curl, CURLOPT_URL, $url);
//
//        $res = curl_exec($curl);
//        curl_close($curl);
//
//        return $res;
//
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
// curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
// curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

        $temp = curl_exec($ch);
        curl_close($ch);
        return $temp;
    }
    
    public function getmedia($media_id,$username){
        $url = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=".$this -> getAccessToken()."&media_id=".$media_id;  
        if (!file_exists("./Uploads/User_cert/".$username)) {  
          mkdir("./Uploads/User_cert/".$username, 0777, true);  
        }  
        $targetName = './Uploads/User_cert/'.$username.'/'.date('YmdHis').rand(1000,9999).'.jpg';  
        $ch = curl_init($url); // 初始化
        $fp = fopen($targetName, 'wb'); // 打开写入
        curl_setopt($ch, CURLOPT_FILE, $fp); // 设置输出文件的位置，值是一个资源类型
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_exec($ch);
        curl_close($ch);
        fclose($fp);
        return $targetName;
    }
}
